Chair.



G. KNAUER.

CHAIR.

APPLICATION FILED $221.18, 1911.

1 95 90 v Patented May 5, 1914.

FIG. 2

WITNESSES:

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UNITED STATES PATNT @FFTfiE.

CASPER KNAUER, OF BROOKLYN, NEw YOld-K, ASSIGNOR TO UNDERWOOD TYPE-- WRITER COMPANY, OF NEW YORK, Y., A CORPORATION OF DELANABE.

CHAIR.

Specification of Letters Patent.

Patented May 5, 1914.

Application filed September 18, 1911. Serial No. 649,804.

To all whom it may concern Be it known that I, Casrne KNAUER, a citizen of the United States, residing in the borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Chairs, of which the following is a specification.

This invention relates to chairs for typewriter operators and others.

A central support rises from the seat, and a back is adjustable thereon vertically. Heretofore, the back was held by a bolt passing through a vertical slot in said support, and threading into the back. -The support being made of wood, said slot weakened the structure; so that the back was lia ble to split. Moreover, it was diflicult to tighten the bolt sufficiently to secure the back. The washer was sometimes pressed into the wood and marred or grooved the support.

The objects of my invention are to avoid the foregoing objections. I provide a reinforce in the form of a clip whose jaws engage the support on opposite sides. The bolt passes through an aperture in said clip and through said slot and threads into the back, whereby the hand wheel on said bolt is tightened. The clip is caused to hold the sides of said support against the torsion caused by leaning heavily against one side of the back, whereby splitting is prevented. The large bearing surface afforded by the clip or reinforce prevents marring of the support, causes a firmer hold when tightened, and also avoids or reduces the liability of the handle or bolt to loosen.

In the accompanying drawings, Figure 1 is a general perspective view of a typewriter operators chair with my improvements shown thereon. Fig. 2 is a full-size transverse section of the back support at the axis of the handle, and shows the manner of tightening the back. Fig. 3 is a rear'viewof the back. Fig. 4: is a detail of the reinforce.

The seat 1 is mounted on legs 2 withthe suit various operators. To the back 1 is fixed centrally a metal back plate 5 having a rib 6 which fits into a groove 7 formed upon the support 3, whereby the back can slide vertically therealong. Plate 5 has a tapped hole 8 and a hand wheel having a bolt 10, passes through a vertical slot 11 and threads into said hole to tighten the back 4 on support 3, to maintain it where adjusted. Between the inner flat surface 12 of hand wheel 9 and the support 3, is disposed a slidable reinforce in the form of a clip 13 having an opening 14 through which the bolt 10 passes, against which the hand wheel is tightened when the back is secured. The sides 15 of the metal reinforce 13 bearing against the surfaces 16, strengthen it against the torsion incurred when the back 1 is leaned against heavily at) one side, whereby splitting of the support 3 is prevented. The large bearing surface 17 of clip 13 enables to secure the back 4 in adjusted position without requiring the application of excessive strength when tightening the hand wheel 9.

Having thus described my invention, I claim:

1. In a chair, the combination of a slotted wooden back support substantially rectangular in cross section, a back provided with a nut and a rib fitting the slot extending the width of the back-rest. a clamping bolt passing through the slot of the support and taking into the nut of the back, and a substantially U-shaped clip adapted to and closely embracing the support in any position of adjustment, said clip being provided with a perforation whereby it serves as a washer for the clamping bolt, the construction being such that the clip serves at all times to prevent the support from splitting or spreading under torsional or transverse strain, substantially as described.

2. In a chair, the combination of a slotted wooden back support having substantially said support in any position of adjustment, spreading under torsional or transverse said clip being provided With a perforation strain, substantially as described.

tlirou h Which perforation the clam aing w T 7 bolt p asses, whereby said clip serves a- CASPLR Washer for the bolt, the construction being such that the said clip serves at all times to prevent the support from splitting or Witnesses PAUL ZIRON, K. FRANKFORT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

